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space physiology studiesCalculations suggest that exercise in space to date has lacked sufficient loads to maintain musculoskeletal mass. Lower body negative pressure (LBNP) produces a force at the feet equal to the product of the LBNP and body cross-sectional area at the waist. Supine exercise within 50-60 mm Hg LBNP improves tolerance to LBNP and produces forces similar to those occurring during upright posture on Earth. Thus, exercise within LBNP may help prevent deconditioning of astronauts by stressing tissues of the lower body in a manner similar to gravity and also, may provide a safe and effective alternative to centrifugation in terms of cost, mass, volume, and power usage. We hypothesize that supine treadmill exercise during LBNP at one body weight (50-60 mm Hg LBNP) will provide cardiovascular and musculoskeletal loads similar to those experienced while upright in lg. Also, daily supine treadmill running in a LBNP chamber will maintain aerobic fitness, orthostatic tolerance, and musculoskeletal structure and function during bed rest (simulated microgravity).
Document ID
20000020595
Document Type
Conference Paper
Authors
Hargens, A. R.
(NASA Ames Research Center Moffett Field, CA United States)
Ballard, R. E.
(California Univ. San Diego, CA United States)
Boda, W. L.
(Sonoma State Univ. CA United States)
Ertl, A. C.
(Vanderbilt Univ. United States)
Schneider, S. M.
(NASA Johnson Space Center Houston, TX United States)
Hutchinson, K. J.
(California Univ. San Diego, CA United States)
Lee, S. M.
(NASA Johnson Space Center Houston, TX United States)
Murthy, G.
(California Univ. San Diego, CA United States)
Putcha, L.
(NASA Johnson Space Center Houston, TX United States)
Watenpaugh, D. E.
(University of North Texas Denton, TX United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Publication Information
Publication: Proceedings of the First Biennial Space Biomedical Investigators' Workshop
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle20000020485Analytic PrimaryProceedings of the First Biennial Space Biomedical Investigators' Workshop
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